Some standard content:
National Standard of the People's Republic of China
Laboratory glassware
Ground flasks
Laboratory glassware--Ground flasks1 Subject content and scope of application
GB/T15725.6-1995
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of ground flasks. This standard applies to laboratory ground flasks. 2 Reference standards
GB191 Pictorial markings for packaging, storage and transportation
GB2828 Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches)GB/T6579 Laboratory glassware thermal shock test methodGB/T6580 Test method and classification of glass resistance to corrosion by boiling mixed alkali aqueous solutionGB/T6582 Test method and classification of particles of glass at .98℃ GB12213 Technical drawing glassware representation methodGB/T1 5726 Internal stress test method for glassware GB/T15728 Weight test method and classification for resistance of glass to boiling hydrochloric acid erosion QB517 Terminology for appearance defects of instrument glass products QB1504 Interchangeable conical frosted joints for laboratory glassware ZBQ30-002 Determination method for average linear thermal expansion coefficient of glass 3＇Product classification
3.1 Types of ground mouth flasks
Divided into ground mouth spherical round bottom flasks, ground mouth spherical flat bottom flasks, ground mouth conical flasks and iodine value flasks. 3.2 Specification series
3.2.1 The specification series of ground mouth spherical round bottom flasks are: 50, 100, 250, 500, 1000, 2000 and 4000mL. 3.2.2 The specification series of ground mouth spherical flat bottom flasks are: 50, 100, 250, 500, 1000, 2000 and 4000mL. .3.2.3 The specifications of ground-mouth conical flasks are: 25, 50, 100, 250, 500, 1000, 2000, 3000 and 5000 mL. 3.2.4 The specifications of iodine value flasks are: 50, 100, 250, 500 and 1000 mL. 3.3 Structural type and size
3.3.1 The types and sizes of ground-mouth spherical round-bottom flasks are shown in Figure 1 and Table 1. Approved by the State Bureau of Technical Supervision on October 24, 1995 38
Implementation on July 1, 1996
Outer diameter of bottle
51.0±1.0
64.0±1.5
85.0±2.0
105.0±2.0
131.0±3.0
166.0±3.0
207.0±3.0
Minimum wall thickness
GB/T15725.6—1995
Series 1
2 The types and dimensions of ground-mouth spherical flat-bottom flasks are shown in Figure 2 and Table 2. 3.3.2
Standard grinding interface specifications
Series 2||tt ||Standard interface specifications
Bottle outer diameter
51-0±1:0
64-0±1.5
131:0±30
166.0±3.0
2070±3.0
Minimum wall thickness
GB/T15725.6—1995
Series Engineering
3.3.3 The types and dimensions of ground-mouth conical flasks are shown in Figure 3 and Table 340
Standard grinding interface specifications
Series 2
Standard grinding interface specifications
Bottle outer diameter
105-0±2.0
131.0±3.0
166.0±3.0| |tt||187.0±3.0
220.0±3.0
GB/T15725.6—1995
Full height of bottle
85.0±3.0
105.0±3.0
140.0±3.0
175:0±4:0
2200±40
280.0±4.0
310.0±5.0
365.0±5.0
For the type and size of iodine value flask, please refer to Figure 4 and Table 4. Minimum wall thickness
Standard grinding interface specifications
Outer diameter of bottle
51.0±1.0
64. 0±1.5
85.0±2.0
105.0±2.0
131.0±3.0
GB/T1572 5.61995
Full height of bottle
85.0±3.0
105.0±3.0
140.0±3.0|| tt||175.0±4.0
220.0±4.0
Minimum wall thickness
Standard mouth
$19/17
$29/22
$29/22
$34/23
3.3.5 Ground-mouth conical flasks and iodine value flasks should have standard interchangeable stoppers. Standard frosted joints should comply with the provisions of QB1504, and non-standard male interchangeable frosted joints are allowed.
4 Technical requirements
4.1 Material
Ground-mouth flasks should be made of borosilicate glass with appropriate chemical and thermal stability, preferably 3.3 borosilicate glass. 4.1.1 Linear expansion coefficient and water resistance, acid resistance and alkali resistance should comply with the requirements of Table 5. 42
GB/T15725.61995
Linear expansion coefficient of glass in the range of 20～300℃ Water resistance
Acid resistance
Alkali resistance
<5.5×10-K-1
Note: When the buyer needs the heat shock resistance value of the flask with special specifications and wall thickness, the test can be carried out according to GB/T6579. 4.1.2 Color
The glass used to make the ground flask should be colorless and transparent, and the light yellow-green color of the glass itself is allowed; brown transparent glass can also be used for conical flasks and iodine value flasks.
4.2 Internal stress
The optical path difference value of birefringence should not exceed 180nm/cm. 4.3 Structure
4.3.1 Frosted interface
The standard frosted interface of the ground flask should meet the requirements of QB.1504. Flasks are allowed to use non-standard frosted interfaces, and non-standard frosted interfaces should be numbered on the mouth and plug.
4.3.2 Bottle bottom
The transition radius between the bottom and wall of ground-mouth conical flasks and iodine value flasks is 15% to 20% of the maximum outer diameter of the bottle body. The flask should not be rotated or shaken when placed on a platform.
4.4 Appearance requirements
4.4.1 Bubbles
Thin-skinned bubbles and broken bubbles are not allowed to exist. The number of bubbles with a diameter less than 0.5mm that can be visually observed shall not exceed 3 within an area of 10mm×10mm. At the same time, it should not exceed the requirements of Table 6.
50~100
250~500
1000~2000
3000~5000
Bubble diameter, mm
Bubble diameter of neck
Bubble diameter of wall
Total number of bubbles in neck and wall
Note: Bottom refers to the part below 1/6 (round bottom products) or 1/10 (flat bottom products) of the bottle body, body refers to the part above 1/6 (round bottom products) of the bottle body, neck refers to the part below the bottle mouth and above the bottle body.
4.4.2 Nodules,
Nodules smaller than 0.5mm that can be visually observed at the bottom shall not exceed 2 within an area of 10mm×10mm, and shall not exceed the requirements of Table 7.
50~100
250~500
1000~2000
3000~5000
4.4.3 Stone
Diameter of nodule, mm
GB/T15725.6—1995
Diameter of cervical nodule
05~：0
015~50
Diameter of wall nodule
0:53:0
035~40||t t||Total number of nodules in the neck and wall
No stones are allowed at the bottom. There shall be no more than one stone smaller than or equal to 0.3mm that can be visually observed within 10mm×10mm in the body and shall not exceed the requirements of Table 8
50~100
250~500
1000~2000
3000~5000
4.4.4 Streaks
Length of stones in the neck
No serious striations are allowed (for comparison of samples) 4.4.5 Rust and iron filings
No obvious visual rust and iron filings are allowed 5 Test methods
5.1 Size
Measurement tool: Use 0.02mm vernier caliper, 5.2 Frosted interface
5.2.1 The test method of standard frosted interface shall be implemented in accordance with QB1504. Length of wall stone
08--25
Neck and total number of stones
5.2.2 The test method of non-standard frosted interface is: fill 2/3 of the bottle with water, turn it upside down 10 times (each time for no less than 10s), and no water should seep out.
5.3 Material
5.3.1 Linear expansion coefficient
Methods shall be in accordance with ZBQ30002
5.3.2 Water resistance
Methods shall be in accordance with GB/T6582
5.3.3 Acid resistance
Methods shall be in accordance with GB/T15728.
5.3.4 Alkali resistance
Methods shall be in accordance with GB/T6580. wwW.bzxz.Net
5.4 Internal stress
Methods shall be in accordance with GB/T15726.
5.5 Appearance requirements
GB/T15725.6—1995
Use visual inspection, and the measuring tools shall be 0.02mm vernier caliper and 10x reading magnifying glass. Thin-skinned bubbles can be tested by piercing them with a pin. Those that are pierced are thin-skinned bubbles. 6 Inspection rules
6.1 Inspection categories
Product inspection is divided into factory inspection and type inspection. 6.2 Factory inspection (or delivery inspection)
Inspection items and requirements
Products should be inspected according to the items and requirements specified in Table 9 when leaving the factory. Products that pass the inspection are allowed to leave the factory. Products must have qualified
Inspection items
4: 4 items
Test items
5-1 item
155 items
6.2.2 Batch
Products of the same variety and specification delivered at the same time are called a batch. 6.2.3 Random inspection method
Inspection shall be carried out in accordance with GB2828
6.2.4 Sampling
The sampling plan type is
sub-sampling plan.
6.2.5 Inspection level
According to the general inspection level!
6.2.6 Acceptable quality level
The overall acceptable quality level (AQL) is 6.5. 6.3 Type inspection
6.3.1 Inspection items and requirements
Factory inspection
Type inspection
The items of type inspection are all items of 3.3.1 to 3.3.4 and technical requirements. The test method of Chapter 15 shall be used for testing and shall meet the requirements.
6.3.2 In the following circumstances
Type inspection shall be conducted temporarily
Trial and prototype identification of new products or old products for conversion to production: After formal production, if there are major changes in structure, materials, and processes that may affect product performance, type inspection shall be conducted at least once a year
In normal production, an inspection shall be conducted periodically after a certain amount of production has been accumulated. When the product is discontinued for more than half a year and then resumed: When there is a significant difference between the factory inspection results and the last type inspection results: When the national quality supervision agency proposes a type inspection requirement. 6.3.3 Sampling and batching rules
All samples shall be randomly selected from qualified products, and sampling shall be carried out in accordance with Article 6.2.4. The inspection sampling in Article 4.1 shall be prepared separately in accordance with the sample requirements in Article 5.3.
6.4 Judgment rules
GB/T15725.6—1995
Inspect according to the items specified in Table 9. If all items meet the requirements, the batch of products is qualified. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Flask marking
The approximate capacity graduation table can be printed on the outside of the ground-mouth conical flask and iodine value flask, see Appendix A (reference): Nominal capacity: such as \100mL\ or "100" b.
Manufacturer name or registered trademark;
When the material of the flask is difficult to identify, the material should be indicated; there should be a place on the bottle body that is suitable for marking with a pencil. Packing box marking
Outer packaging should comply with the relevant provisions of GB191; this standard number,
product name, specification quantity, net weight, gross weight, volume, manufacturer name, registered trademark, production date; factory address, telephone, telegram.
7.2 Inner packaging
7.2.1 The inner packaging is a carton with labels (product name, specification, quantity) on both ends. The packaging quantity should be a multiple of ten, and fillers such as paper scraps and foam plastics should not be used.
7.2.2 The total length, width and height of the outer packaging carton should not exceed 1.5m (it should be rectangular). The outer edge of the package should be sealed, and the packaging tape should be tied in a well shape. The packaging should comply with the transportation regulations.
7.3 Transportation
This product can be transported by any means of transportation. It should not be thrown during loading and unloading, and rain and snow protection measures should be taken during transportation. 7.4 Storage
The product should be stored indoors after packaging. The stacking height should not exceed ten layers. It is strictly forbidden to contact with strong acid, strong alkali and fluoride. 46
GB/T15725.6—1995
Appendix A
Approximate capacity graduation table of ground conical flasks and iodine value flasks (reference)
Approximate capacity graduation table of ground conical flasks and iodine value flasks is shown in Table A1: Table A1
Additional notes:
Lowest graduation line
This standard is proposed by China Light Industry General Association.
Highest graduation line
Maximum fine division
This standard is under the jurisdiction of the National Technical Committee for Standardization of Glass Instruments. This standard was drafted by Beijing Glass Instrument Factory and jointly drafted by Tianjin Glass Instrument Factory, Shanghai Asia Pacific Technology Glass Company and Qinchuan Glass Instrument Factory.
The main drafters of this standard are Liu Jiajun, Zheng Limei, Chen Tingzhen, Chen Zhenlin and Qian Xiuting.2 In the following cases
Type inspection is conducted temporarily
Trial and final product identification for new products or old products for production conversion: After formal production, if there are major changes in structure, materials, and processes that may affect product performance, type inspection shall be conducted at least once a year
In normal production, an inspection shall be conducted periodically after a certain amount of production has been accumulated. When the product is stopped for more than half a year and then resumed: When there is a significant difference between the factory inspection results and the last type inspection: When the national quality supervision agency proposes a requirement for type inspection. 6.3.3 Sampling and batching rules
All samples shall be randomly selected from qualified products, and sampling shall be carried out in accordance with Article 6.2.4. The inspection sampling in Article 4.1 shall be prepared separately in accordance with the sample requirements in Article 5.3.
6.4 Judgment rules
GB/T15725.6—1995
Inspect according to the items specified in Table 9. If all items meet the requirements, the batch of products is qualified. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Flask marking
The approximate capacity graduation table can be printed on the outside of the ground-mouth conical flask and iodine value flask, see Appendix A (reference): Nominal capacity: such as \100mL\ or "100" b.
Manufacturer name or registered trademark;
When the material of the flask is difficult to identify, the material should be indicated; there should be a place on the bottle body that is suitable for marking with a pencil. Packing box marking
Outer packaging should comply with the relevant provisions of GB191; this standard number,
product name, specification quantity, net weight, gross weight, volume, manufacturer name, registered trademark, production date; factory address, telephone, telegram.
7.2 Inner packaging
7.2.1 The inner packaging is a carton with labels (product name, specification, quantity) on both ends. The packaging quantity should be a multiple of ten, and fillers such as paper scraps and foam plastics should not be used.
7.2.2 The total length, width and height of the outer packaging carton should not exceed 1.5m (it should be rectangular). The outer edge of the package should be sealed, and the packaging tape should be tied in a well shape. The packaging should comply with the transportation regulations.
7.3 Transportation
This product can be transported by any means of transportation. It should not be thrown during loading and unloading, and rain and snow protection measures should be taken during transportation. 7.4 Storage
The product should be stored indoors after packaging. The stacking height should not exceed ten layers. It is strictly forbidden to contact with strong acid, strong alkali and fluoride. 46
GB/T15725.6—1995
Appendix A
Approximate capacity graduation table of ground conical flasks and iodine value flasks (reference)
Approximate capacity graduation table of ground conical flasks and iodine value flasks is shown in Table A1: Table A1
Additional notes:
Lowest graduation line
This standard is proposed by China Light Industry General Association.
Highest graduation line
Maximum fine division
This standard is under the jurisdiction of the National Technical Committee for Standardization of Glass Instruments. This standard was drafted by Beijing Glass Instrument Factory and jointly drafted by Tianjin Glass Instrument Factory, Shanghai Asia Pacific Technology Glass Company and Qinchuan Glass Instrument Factory.
The main drafters of this standard are Liu Jiajun, Zheng Limei, Chen Tingzhen, Chen Zhenlin and Qian Xiuting.2 In the following cases
Type inspection is conducted temporarily
Trial and final product identification for new products or old products for production conversion: After formal production, if there are major changes in structure, materials, and processes that may affect product performance, type inspection shall be conducted at least once a year
In normal production, an inspection shall be conducted periodically after a certain amount of production has been accumulated. When the product is stopped for more than half a year and then resumed: When there is a significant difference between the factory inspection results and the last type inspection: When the national quality supervision agency proposes a requirement for type inspection. 6.3.3 Sampling and batching rules
All samples shall be randomly selected from qualified products, and sampling shall be carried out in accordance with Article 6.2.4. The inspection sampling in Article 4.1 shall be prepared separately in accordance with the sample requirements in Article 5.3.
6.4 Judgment rules
GB/T15725.6—1995
Inspect according to the items specified in Table 9. If all items meet the requirements, the batch of products is qualified. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 Flask marking
The approximate capacity graduation table can be printed on the outside of the ground-mouth conical flask and iodine value flask, see Appendix A (reference): Nominal capacity: such as \100mL\ or "100" b.
Manufacturer name or registered trademark;
When the material of the flask is difficult to identify, the material should be indicated; there should be a place on the bottle body that is suitable for marking with a pencil. Packing box marking
Outer packaging should comply with the relevant provisions of GB191; this standard number,
product name, specification quantity, net weight, gross weight, volume, manufacturer name, registered trademark, production date; factory address, telephone, telegram.
7.2 Inner packaging
7.2.1 The inner packaging is a carton with labels (product name, specification, quantity) on both ends. The packaging quantity should be a multiple of ten, and fillers such as paper scraps and foam plastics should not be used.
7.2.2 The total length, width and height of the outer packaging carton should not exceed 1.5m (it should be rectangular). The outer edge of the package should be sealed, and the packaging tape should be tied in a well shape. The packaging should comply with the transportation regulations.
7.3 Transportation
This product can be transported by any means of transportation. It should not be thrown during loading and unloading, and rain and snow protection measures should be taken during transportation. 7.4 Storage
The product should be stored indoors after packaging. The stacking height should not exceed ten layers. It is strictly forbidden to contact with strong acid, strong alkali and fluoride. 46
GB/T15725.6—1995
Appendix A
Approximate capacity graduation table of ground conical flasks and iodine value flasks (reference)
Approximate capacity graduation table of ground conical flasks and iodine value flasks is shown in Table A1: Table A1
Additional notes:
Lowest graduation line
This standard is proposed by China Light Industry General Association.
Highest graduation line
Maximum fine division
This standard is under the jurisdiction of the National Technical Committee for Standardization of Glass Instruments. This standard was drafted by Beijing Glass Instrument Factory and jointly drafted by Tianjin Glass Instrument Factory, Shanghai Asia Pacific Technology Glass Company and Qinchuan Glass Instrument Factory.
The main drafters of this standard are Liu Jiajun, Zheng Limei, Chen Tingzhen, Chen Zhenlin and Qian Xiuting.
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